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30 Maritime Reporter & Engineering News consumption. This is particularly impressive in light of the fact that the output of the three modified engines is increased by up to 25 percent. The uprated engines will be launched only in "relevant cylinder numbers," meaning that the K80/K90 engines are available with 6 to 12 cylinders, and the S80ME-
C are available with 6 to 9 cylinders.
The engines increased power is partic- ularly significant as the higher specific output means that engines with fewer cylinders can be applied, helping to reduce cost and weight. One major design change that significantly cuts cost and weight is the introduction of differentiated cylinder distances. It is possible to use shorter cylinder dis- tances in the fore cylinder units, as the torque to be transferred through the crank throws is smaller compared to the aft of the engine. For example, for a 12K90ME/ME-C Mark 9 engine, the six foremost cylinder units can have a cylinder distance of 1492 mm compared to 1602 mm for the six aft cylinder units.
The weight savings is 25 tons, and the total engine length is shortened by more than .5 m. On the 8K90ME/ME-C the numbers are even better, as the shorter cylinder distance can be applied on all cylinders, offering a weight savings of 34 tons and an engine length reduction of nearly one meter.
The updated engines, like the new engines among the ME/ME-C/MC-C types, have a triangular plate frame-box with twin stay bolts. When setting out to develop the concept, the company laid out several criteria to meet, including: the design should match or be superior to existing MAN B&W design in terms of functionality; it should help to reduce production costs; there should be an uprating potential without losing pro- duction benefits; and it should be possi- ble to introduce a design prepared for omission of Post Weld - Heat Treatment (PW-HT).
MAN B&W Logs Orders for New Engine Types
MAN B&W Diesel introduced two new engines - S35ME-B and S40ME-B - an upgrade to the 35MC and 42MC engines to electronically controlled engines designed to provide better econ- omy, management and maneuverability.
Before upgrading the engines, the engine maker studied the market and concluded that the power against pro- peller speed for tankers, containers and bulkers in the size bracket showed that a 35 cm bore engine with slightly reduced speed, at 167 rpm, and a higher engine power would suit the market well. In the segment for the S42MC type, the com- pany concluded that a 40 cm bore / B W J H B U J P O # S J E H F 3 B E B S " 3 1 " ( . % 4 4 ' J T I F S Z & $ % * 4 & O H J O F - $ ) 4 4 S W I M H S R M W S R I S J X L I [ S V P H P I E H M R K W Y T T P M I V W S J W M Q Y P E X S V W E R H X I E G L M R K E M H W J S V à Q E V M X M Q I X V E M R M R K 4 S W I M H S R L E W M R W X E P P I H W M Q Y P E X S V W S P Y X M S R W E X Q E V M X M Q I Y R M Z I V W M X M I W W G L S S P W X V E M R M R K G I R X V I W E R H R E Z E P G S E W X K Y E V H E G E H I Q M I W à M R Q S V I X L E R G S Y R X V M I W [ S V P H [ M H I à 4 S W I M H S R P S S O J S V [ E V H X S L I E V J V S Q ] S Y X S H M W G Y W W X V E M R M R K G S R G I T X W J S V ] S Y V S V K E R M W E X M S R 3 R V H L G R Q 6 L P X O D W L R Q $ 6 3 2 % R [ 1 / ( . 1 ( 6 1 2 5 : $ < 7 ) ( L Q I R # S R V H L G R Q Q R Z Z Z S R V H L G R Q Q R 4 J N V M B U P S T B O E U S B J O J O H D P O D F Q U T
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Tel: 604-879-2974 Fax: 604-879-6588 E-Mail: [email protected]
LO-REZ VIBRATION CONTROL has been dedicated to the design and manufacture of vibration control equipment since the 1950's.
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